public void addMapBaseLayerChangedListener(final MapBaseLayerChangedListener listener) {
eventListeners.addListener(this, listener,
EventType.MAP_BASE_LAYER_CHANGED, new EventHandler() {
public void onHandle(EventObject eventObject) {
MapBaseLayerChangedEvent e = new MapBaseLayerChangedEvent(
eventObject);
listener.onBaseLayerChanged(e);
}
});